Labels:text OCR: NUCLEAR POWER STEEL NEUTRON SHIELD CONTROL RODS Immense heat is generated COOLANT HOT by the fission IN COOLANT of the uranium fuel in OUT the core of a nuclear reactor. FUEL RODS A gas or liquid coolant carries the heat away from the core to a steam generator. The main type of reactor used in nuclear power stations is the pressurized- water reactor (PWR). This uses water as the coolant. Nuclear Fission